Administratrix of



(No Model.) ZSheets-Sheet 2. W. G. STILES, Deod.

M. A. STILES,AdmiI1i$tratI'iX. ORE GRUSHING MILL.

No. 423,832. Patented Mar. 18, 1890.

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UNITED STATES PATENT ()FFICE.

MARY A. STILES, OF SAN FRANCISCO, CALIFORNIA, ADMINISTRATRIX OF WILLIAM C. STILES, DECEASED, ASSIGNOR TO THE STILES MILL AND CONCENTRATOR MANUFACTURING COMPANY, OF SAME PLACE.

ORE -CRUSHING MILL.

SPECIFICATION forming part of Letters Patent No. 423,832, dated March 18, 1890.

Application filed January 2, 1890.

T0 at whom it may concern:

Be it known that WILLIAM C. STILEs, a citizen of the United States, and late residing at the city and county of San Francisco, State of California, but now deceased, did during his lifetime invent certain'new and useful Improvements in Ore-Crushing Mills, and that at the time of his death he had one of the said improved machines actually constructed and in operation; and I do hereby declare the following to be a full, clear, and exact description of said invention, such as Will enable others skilled in the art to which it relates to make and use the same. Thesaid invention relates to mills forcrushng and grinding ores and other substances, and is of that class shown in Letters Patent of the United States No. 326,253, granted on the 15th day of Septe1nber,1885, to the aforesaid William C. Stiles.

In the aforesaid patent a double cone operates in connection with revolving faces of two cones placed reversely to each other. A difliculty has arisen in the operation of this machine resulting from the clogging and rapid wear and imperfect yielding of the springs, owing to their relation to the lines of resistance. In the present invention single overlapping cones are usedin a free space, so that no cloggingis possible. The cones are mounted on the ends of independent shafts in substantially parallel lines. The springs press the cones toward-each other, so thatthey may yield against the springs and directly away from each other. Further, the opposing faces ofthe two cones and parts of each cone are caused to move in the same direction at different rates of speed, whereby the material is caused to be crushed and rubbed intoitself. The mill is not strictly a grinding-mill, but by its peculiar operation effects a rubbing action of the material itself upon its own particles.

The invention further consists in details of construction, all as hereinafter described.

In the accompanying drawings, which illustrate the invention, Figure 1 represents a side elevation of the mill, the upper part being in longitudinal section. Fig. 2 is a plan view Serial No. 335,661. (No model.)

with the housing wholly removed. .Fig. 3 is to overlap each other, substantially as shown;

in the drawings, and are provided with a chute K, arranged in a higher plane and so as to discharge the ore which is to be crushed directly to the overlapping surfaces of the disks.

It was found that when the chute was properly arranged,in the manner shown more particularly in Fig. 2, so as to drop the ore between the overlapping portions-of the disk, that the ore once caught upon the revolving faces would be carried through and crushed or ground and would be prevented from falling out into the clear space on or beyond the peripheries of the disks and outside ofthe overlapping faces. revolve at different relative rates of speed, one disk, for example, having larger pulley D, revolving atthe rate of about seven hundred revolutions per minute, while the shaft having a smaller pulley d revolves at the rate of one thousand revolutions per minute; butthese relative rates may be Varied. The unequal revolutions cause the disks to operate both as grinding and crushing disks. The pieces of ore or other material falling into the wedge-shaped spaces between the disks are carried forward and crushed by the approaching surfaces, and at the same time are subjected to grinding action by reason of the unequal relative revolutions. The grinding action continues until the material which has been crushed has passed through between the faces at the point or 011 the line of their nearest approach to each other. The grind- -The disks are caused to ing action is in itself of the nature of crushing, inasmuch as the material while it is crushed is by the unequal movement of the opposing faces rubbed upon itself or ground into itself.

It will be understood that the opposing faces of the disks move toward each other, so that the ore is carried through.

In the patent of Stiles heretofore referred to the axis of the double disks is supported in a movable frame and is held normally up to the work by springs. lVhen any substance is fed to the material-such as a bit of iron, piece of tool, or anythingof a nature which does not admit of crushing in the millt-he tendency of such substance is to break the disks, the force acting with the greatest effect in lines at right angles to the opposing faces. 'lhus'a destructive strain is placed upon the mill by reason of the location of the springs, and also from clogging due to the peculiar arrangement of the double cones. This is obviated in the present invention by the arrangement of the pair of disks, together with the arrangement of the spring or springs which hold the disks to their work and provide for the necessary yielding, said arrangement of the springs being in line with the shafts and nearly in the direction of the resistance of an unyielding body passing through the mill between the opposing faces. This arrangement is shown more clearly in Figs. 1 and 2, where a block F, movable in guides in the loop E, bears against the end of the shaft B, holding the disk which that shaft carries up to its work and allowing it to yield against undue pressure. The tension of the spring is regulated by a set-screw h in the crown of the loop. The casing I covers the mill and prevents the dust from scattering therefrom, and this is provided with a hopper J directly over the chute K. The chute K is mounted on a horizontal bar a. This is supported at one end by a spring-standard b, the opposite end being pivoted in an upright pivoted bar (Z. The crank on the driving shaft B is connected with this upright bar (1 by a shaft f and connecting-rod c. This rod forms practically an arm, it being fixed to the shaft f, on which the bar (I is pivoted, and as the shaft rocks slightly it gives longitudinal movement to the bar a, and thus agitates the chute.

A screen P is arranged directly underneath the disks, as shown in Fig. It is mounted on spring-legs q q and stands at an incline.

The cross-bar underneath the screen and attached to it is connected also to the lower oscillating end of the bar (1, whereby the screen receives lateral oscillation, producing a rcqut site amount of shaking. Any suit-able pan for receiving what passes through the screen may be placed underneath.

It will be understood that the screens may be duplicated or modified, as well known in the art. The part of the ore which is sufficiently reduced will pass through the screen, and the remainderwill move down the incline of the screen and be discharged from the tail thereof and the invention contemplates another mill placed lower down,but of the same form and construction as that above described, it being adapted to receive the unreduced material discharged from the screen either directly or indirectly into the hopper J. A third mill may be placed in the same position for the reduction of the unreduced ore left by the second.

A third disk may be added to the springdisk, as in Fig. 4, it being the exact duplicate in construction and position as the other or unyielding disk. All or any of the disks may be made to yield.

It is known that single disks have been placed with conical overlapping faces mounted on the ends of independent shafts, as in the patent of Kellogg, January 30, 1866, and that the said disks are revolved at different .rates of speed, but in opposite directions.

What is claimed herein as the invention of the said STILES is as follows:

1. In a mill, disks mounted upon shafts which are arranged in line substantially parallel with each other, said disks being arranged with their faces overlapping and combined with mechanism arranged to drive the opposing faces of the disks toward each other at different rates of speed, substantially as MARY A. STILES, Adntim'sf mh' 4r of the csfa/c of William C.

Stiles.

In presence of- WALTER R. CRAIG, A. A. STILns. 

